I usually go with download links, e.g. posting short messages saying the product can be downloaded through [insert cloaked affiliate link here] but I find the conversion isn't so great. Takes a lot of hops to make a sale. I'm guessing when you tell someone they can download something through a link you've provided, they're not really in 'buying mode', whereas it's probably different with discount links. Everyone wants to save money on a purchase and will probably consider buying from your "discount link". Going to do some promotion using the "discount" route instead and see how that goes.. Any thoughts/experiences on what you've found converts better between the two?